
#main {
    border: solid 5px #c67b24;
  }
  .a{
  
    height: 200px;
    background: url('https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fpic1.win4000.com%2Fwallpaper%2F2018-06-27%2F5b3345789ca2c.jpg&refer=http%3A%2F%2Fpic1.win4000.com&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=auto?sec=1671941093&t=41390596f6b29e9413644b371981c12c');
  }
  .b{
    height: 200px;
  }